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  <title>Document</title>
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    function generateNum() {
      var p = new Promise(function(resolve, reject){
        setTimeout(function(){
          var num =  Math.random()
          resolve(num)
        },2000)
      })
      return p
    }

    $(function(){
      $('button').click(function(){
        generateNum().then(function(data){
            console.log(data);
            
        })
      })
    })
    // 点击按钮调用generateNum, 这个函数内部会在2s后产生一个随机数值, 如何在点击处理函数中使用两种方式得到这个随机值
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